Add support for HLS playlists of type 'event'.

related-to-bug: 6870049

Squashed commit of the following:

commit eee2f3ba6bb7335f4e285632726db85645669929
Author: Andreas Huber <andih@google.com>
Date:   Tue Nov 27 15:02:01 2012 -0800

    Make everything a lot less verbose by default.

    Change-Id: I884d7a7901aa1e7d4ff590f065ca57a79d2af8b3

commit 6bbdb837ed5bd88008e45efb8faf595e4051ba26
Author: Andreas Huber <andih@google.com>
Date:   Tue Nov 27 14:34:46 2012 -0800

    HLS now properly signals media time changes at discontinuities including

    the start of playback (which may not necessarily be at time 0 if the playlist
    is of type 'event' and hasn't completed yet).

    Change-Id: I5ab747d024f9b8d0df72a4e06a12ebb29f62802e

commit 1555589832b1878a144a976a643e1af4d61f877c
Author: Andreas Huber <andih@google.com>
Date:   Tue Nov 27 14:32:28 2012 -0800

    As part of a time discontinuity, clients of IStreamListener can now

    signal the corresponding media time after the discontinuity, i.e. the first PTS
    timestamp following the discontinuity will be considered equivalent to the
    specified media time and media buffers timestamped accordingly.

    Change-Id: Id7db7679b7faa6efd6270620ff52e34e884f3e92

commit 5c24c605c073a11c426d025b1e7478fc1ad8365a
Author: Andreas Huber <andih@google.com>
Date:   Tue Nov 27 13:00:56 2012 -0800

    NuPlayer sources now expose flags() and can announce

    that duration may change (increase) dynamically, in which case duration
    will be polled at 1 second intervals and communicated to the upper layers.

    Change-Id: I45102909b7a19eed0dda576747e3814d742a0eea

commit ecb71de8e281e61971a2cd73e7161a97540bc357
Author: Andreas Huber <andih@google.com>
Date:   Tue Nov 27 12:57:47 2012 -0800

    Stop caching duration in MediaPlayer, duration could increase dynamically.

    Change-Id: I7bb2f16c0abe49debdf45c776d2266aa069d7791

commit 544aec5823e6d7a3e97e15b6b23546616bcd343e
Author: Andreas Huber <andih@google.com>
Date:   Tue Nov 27 08:46:28 2012 -0800

    An attempt to add support for "event" style HLS playlists.

    Change-Id: I3dfb2e801ecaff8f5d8bdb3a4fca1b18aeeb2c60

Change-Id: I48cf7f65a654d33f2f49ded74f8be22aed9e3b98

1 files changed, 24 insertions, 12 deletions

diff --git a/media/libmedia/mediaplayer.cpp b/media/libmedia/mediaplayer.cpp
index b52a37d..bbbf4b6 100644
--- a/media/libmedia/mediaplayer.cpp
+++ b/media/libmedia/mediaplayer.cpp
@@ -47,7 +47,6 @@ MediaPlayer::MediaPlayer()
     ALOGV("constructor");
     mListener = NULL;
     mCookie = NULL;
-    mDuration = -1;
     mStreamType = AUDIO_STREAM_MUSIC;
     mCurrentPosition = -1;
     mSeekPosition = -1;
@@ -90,7 +89,6 @@ void MediaPlayer::disconnect()
 // always call with lock held
 void MediaPlayer::clear_l()
 {
-    mDuration = -1;
     mCurrentPosition = -1;
     mSeekPosition = -1;
     mVideoWidth = mVideoHeight = 0;
@@ -395,14 +393,14 @@ status_t MediaPlayer::getCurrentPosition(int *msec)
 
 status_t MediaPlayer::getDuration_l(int *msec)
 {
-    ALOGV("getDuration");
+    ALOGV("getDuration_l");
     bool isValidState = (mCurrentState & (MEDIA_PLAYER_PREPARED | MEDIA_PLAYER_STARTED | MEDIA_PLAYER_PAUSED | MEDIA_PLAYER_STOPPED | MEDIA_PLAYER_PLAYBACK_COMPLETE));
     if (mPlayer != 0 && isValidState) {
-        status_t ret = NO_ERROR;
-        if (mDuration <= 0)
-            ret = mPlayer->getDuration(&mDuration);
-        if (msec)
-            *msec = mDuration;
+        int durationMs;
+        status_t ret = mPlayer->getDuration(&durationMs);
+        if (msec) {
+            *msec = durationMs;
+        }
         return ret;
     }
     ALOGE("Attempt to call getDuration without a valid mediaplayer");
@@ -422,14 +420,28 @@ status_t MediaPlayer::seekTo_l(int msec)
         if ( msec < 0 ) {
             ALOGW("Attempt to seek to invalid position: %d", msec);
             msec = 0;
-        } else if ((mDuration > 0) && (msec > mDuration)) {
-            ALOGW("Attempt to seek to past end of file: request = %d, EOF = %d", msec, mDuration);
-            msec = mDuration;
         }
+
+        int durationMs;
+        status_t err = mPlayer->getDuration(&durationMs);
+
+        if (err != OK) {
+            ALOGW("Stream has no duration and is therefore not seekable.");
+            return err;
+        }
+
+        if (msec > durationMs) {
+            ALOGW("Attempt to seek to past end of file: request = %d, "
+                  "durationMs = %d",
+                  msec,
+                  durationMs);
+
+            msec = durationMs;
+        }
+
         // cache duration
         mCurrentPosition = msec;
         if (mSeekPosition < 0) {
-            getDuration_l(NULL);
             mSeekPosition = msec;
             return mPlayer->seekTo(msec);
         }